package ListTest;

public class MiddleNode {
    public class ListNode {
        int val;
        ListNode next;
        ListNode() {}
        ListNode(int val) { this.val = val; }
        ListNode(int val, ListNode next) { this.val = val; this.next = next; }
   }
    public ListNode middleNode(ListNode head) {
        ListNode fast = head;
        ListNode slow = head;

        while (fast != null && fast.next != null){
            fast= fast.next.next;
            slow = slow.next;
        }

        return slow;
    }
}
